Cache and cache control

[Ethrel]

Currently, every time the app is launched from closed (shouldn't do it when it's moved from background), it hits bitbucket and pulls in the files. This should be cached with proper cache management to reduce overhead. It's expensive enough doing a full reload.

Another thing that should be looked into is how WebView handles caching and cache data. If WebView isn't set up to cache or doesn't have the ability to cache natively, that should also be handled if possible.